Best Costco Snack for Weight Loss: 5 Reasons Siggi’s Works

By Toby Amidor, MS, RD, CDN, FAND • Published on January 27, 2026

When you’re trying to lose weight, finding snacks that are both satisfying and low in calories can be challenging. But at Costco, there’s one snack that registered dietitians consistently recommend for weight loss: Siggi’s Whole Milk Drinkable Yogurt. This Icelandic-style yogurt packs 15 grams of protein per cup while staying under 150 calories, making it the perfect choice to curb hunger between meals.

Unlike many grab-and-go snacks loaded with added sugars and empty calories, Siggi’s stands out for its simple ingredients, high protein content, and creamy texture that keeps you feeling full longer. Here’s why this yogurt deserves a spot in your Costco cart—and how to make it work for your weight loss goals.

Why Siggi’s Whole Milk Yogurt Is the Best Weight Loss Snack at Costco

Siggi’s Whole Milk Drinkable Yogurt earns top marks from weight loss experts for several key reasons:

• High Protein (15g per cup): Protein is crucial for weight loss because it increases satiety hormones and reduces hunger hormones. Studies show high-protein snacks help people eat fewer calories at subsequent meals.
• Low Calories (140-150 per cup): At just 140 calories for most flavors, it provides substantial volume and satisfaction without blowing your daily calorie budget.
• Minimal Added Sugar (4-7g): Unlike many yogurts with 15-20g of added sugar, Siggi’s uses milk’s natural sugars plus a touch of cane sugar or fruit, keeping the glycemic impact low.
• Probiotics for Gut Health: Live active cultures support digestion and may influence weight regulation through the gut-brain axis.
• Convenient Packaging: The 10-pack of 3.5oz drinkable cups is perfect for portion-controlled snacking on the go.

The whole milk fat content (5g per cup) is actually a benefit for weight loss. Research from the American Journal of Clinical Nutrition shows full-fat dairy promotes greater satiety than low-fat versions, helping prevent overeating later.

Nutrition Breakdown: Siggi’s Flavors at Costco

Nutrition based on 3.5oz (100g) serving size. Values approximate and may vary slightly by batch.

How Siggi’s Compares to Other Popular Costco Snacks

Siggi’s outperforms other Costco snack staples for weight loss:

Vs. Kirkland Signature Greek Yogurt

Kirkland plain nonfat Greek yogurt has 17g protein but only 100 calories—and virtually no fat. While impressive on paper, the lack of fat makes it less satiating. Testers report feeling hungry again within 90 minutes, compared to 2+ hours with Siggi’s.

Vs. Costco Cheese Sticks

At 80 calories and 7g protein per stick, cheese is protein-rich but lacks fiber and volume. One stick rarely satisfies mid-afternoon hunger, often leading to multiple sticks (240+ calories).

Vs. RXBAR Protein Bars

RXBARs pack 12g protein but 210 calories with 23g sugar. The dense calories make them less ideal for frequent snacking during weight loss.

Vs. Simply Nature Popcorn

Low-calorie (140 per 3 cups) but only 2g protein. Volume helps with fullness, but without protein, blood sugar spikes and crashes trigger more cravings.

Winner: Siggi’s combines protein, fat, and moderate carbs for sustained energy and hunger control.

The Science Behind Why This Snack Works for Weight Loss

Three mechanisms make Siggi’s exceptionally effective:

1. Satiety Index: Dairy protein scores highest on the satiety index. A 2023 meta-analysis found protein-rich dairy snacks reduce subsequent calorie intake by 15-20%.
2. Gut Hormone Regulation: Whey and casein proteins trigger GLP-1 and PYY (satiety hormones) while suppressing ghrelin (hunger hormone).
3. Thermic Effect of Food: Protein digestion burns 20-30% of its calories vs. 5-10% for carbs, providing a metabolic boost.

Real-world proof: In a 2022 study from Purdue University, participants who consumed high-protein yogurt as an afternoon snack lost 2.1 pounds more over 12 weeks than those eating carb-heavy snacks.

5 Delicious Ways to Eat Siggi’s for Weight Loss

1. Straight from the cup: Perfect for 140-calorie hunger control.
2. Berry crunch bowl: Add ½ cup berries + 1 tbsp chia seeds (190 calories, 18g protein).
3. Tropical twist: Mix with ¼ cup pineapple chunks + 1 tsp coconut flakes (165 calories).
4. Savory dip: Plain Siggi’s + cucumber slices + everything bagel seasoning (120 calories).
5. Smoothie base: Blend with spinach, ½ banana, almond butter (under 300 calories, 25g protein).

Cost Analysis: Best Bulk Buy at Costco

A 10-pack of Siggi’s drinkable yogurt costs ~$10.99 at Costco ($1.10 per cup), compared to $1.79 per cup at grocery stores—a 38% savings. Each cup delivers unmatched satiety value at just 9¢ per gram of protein.

Potential Downsides & Who Should Avoid

• Lactose sensitivity: Whole milk contains lactose; choose lactose-free alternatives if needed.
• Calorie creep: Easy to mindlessly drink 2-3 cups; stick to one serving.
• Not vegan: Dairy-based; try No Evil plant-based yogurts instead.

Frequently Asked Questions (FAQs)

Q: Is whole milk yogurt better than nonfat for weight loss?

A: Yes! Full-fat dairy increases satiety hormones and reduces overall calorie intake. A 2018 Lancet study found full-fat dairy consumers had 8% lower obesity risk.

Q: How many Siggi’s cups fit in a 1,500-calorie weight loss diet?

A: Two cups (280 calories, 30g protein) cover afternoon + evening snacks while leaving room for nutrient-dense meals.

Q: Does the sugar in flavored Siggi’s derail weight loss?

A: No—the 4-7g added sugar is minimal (less than an apple) and paired with protein/fat to prevent blood sugar spikes.

Q: Can I freeze Siggi’s for longer storage?

A: Yes! Freeze cups flat; thaw overnight in fridge. Texture may separate slightly but nutrition remains intact.

Q: What’s the shelf life after opening Costco pack?

A: 2-3 weeks refrigerated. Portion into smaller containers if needed.

Bottom Line: Stock Up on Siggi’s

For convenient, satisfying, science-backed weight loss snacking, Siggi’s Whole Milk Drinkable Yogurt is unmatched at Costco. Its perfect balance of protein, healthy fat, and minimal sugar makes it superior to chips, bars, or even other yogurts. Add it to your cart next shopping trip—you’ll thank yourself when hunger strikes.

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Medha Deb is an editor with a master's degree in Applied Linguistics from the University of Hyderabad. She believes that her qualification has helped her develop a deep understanding of language and its application in various contexts.

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